62 lines
2.5 KiB
C++
62 lines
2.5 KiB
C++
// Copyright (C) 2020-2021 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// { dg-options "-std=gnu++2a" }
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// { dg-do compile { target c++2a } }
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#include <iterator>
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template<typename T>
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struct Dereferenceable { T operator*(); };
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template<typename T>
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concept has_iter_reference
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= requires { typename std::iter_reference_t<T>; };
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template<typename T, typename U>
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concept is_iter_reference_for
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= has_iter_reference<U> && std::same_as<T, std::iter_reference_t<U>>;
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static_assert(!has_iter_reference<Dereferenceable<void>>);
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static_assert(is_iter_reference_for<int, Dereferenceable<int>>);
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static_assert(is_iter_reference_for<int&, Dereferenceable<int&>>);
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static_assert(is_iter_reference_for<int&&, Dereferenceable<int&&>>);
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static_assert(is_iter_reference_for<int&, int*>);
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static_assert(is_iter_reference_for<const int&, const int*>);
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template<typename T>
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concept has_iter_rvalue_reference
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= requires { typename std::iter_rvalue_reference_t<T>; };
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template<typename T, typename U>
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concept is_iter_rvalue_reference_for
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= has_iter_rvalue_reference<U>
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&& std::same_as<T, std::iter_rvalue_reference_t<U>>;
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static_assert(!has_iter_rvalue_reference<Dereferenceable<void>>);
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static_assert(is_iter_rvalue_reference_for<int, Dereferenceable<int>>);
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static_assert(is_iter_rvalue_reference_for<int&&, Dereferenceable<int&>>);
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static_assert(is_iter_rvalue_reference_for<int&&, Dereferenceable<int&&>>);
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static_assert(is_iter_rvalue_reference_for<int&&, int*>);
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static_assert(is_iter_rvalue_reference_for<const int&&, const int*>);
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// These functions should be found by ADL. std::move is not applied to result.
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long iter_move(Dereferenceable<short>);
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long& iter_move(Dereferenceable<short&&>);
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static_assert(is_iter_rvalue_reference_for<long, Dereferenceable<short>>);
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static_assert(is_iter_rvalue_reference_for<long&, Dereferenceable<short&&>>);
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